How to resize encrypted partition after SSD upgrade

Janus84 · 04-24-2023, 03:49 PM

Thanks for looking,
I have upgraded M.2 drive in my Debian laptop from 500G to 1TB using CloneZilla.
Now I have 500G unallocated and would like to extend my main LUKS partition to the remaining space.
Searching around I found rather confusing info, but understand the main concept.

Code:

$ lsblk
NAME                                          MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
loop0                                           7:0    0   1.6M  1 loop  /snap/modem-manager/426
loop1                                           7:1    0 116.8M  1 loop  /snap/core/14946
loop2                                           7:2    0 116.8M  1 loop  /snap/core/14784
loop3                                           7:3    0   1.6M  1 loop  /snap/modem-manager/516
nvme0n1                                       259:0    0 931.5G  0 disk  
├─nvme0n1p1                                   259:1    0   300M  0 part  /boot/efi
├─nvme0n1p2                                   259:2    0 459.8G  0 part  
│ └─luks-b933ced7-96d3-4f5b-87cd-780e5664aca4 254:0    0 459.8G  0 crypt /
└─nvme0n1p3                                   259:3    0  16.9G  0 part  
  └─luks-ad6d69c9-02a8-47a8-ba1e-6ee6132f3c51 254:1    0  16.9G  0 crypt [SWAP]

Code:

$ blkid /dev/nvme0n1 
/dev/nvme0n1: PTUUID="e93ed2ae-43e8-45b0-bc67-ec75b4918706" PTTYPE="gpt"

Code:

cat /etc/fstab
# <file system>             <mount point>  <type>  <options>  <dump>  <pass>
UUID=5A15-FFC1                            /boot/efi      vfat    defaults,noatime 0 2
/dev/mapper/luks-b933ced7-96d3-4f5b-87cd-780e5664aca4 /              ext4    defaults,noatime 0 1
/dev/mapper/luks-ad6d69c9-02a8-47a8-ba1e-6ee6132f3c51 swap           swap    defaults,noatime 0 2

jamison20000e · 04-24-2023, 05:37 PM

I've never done it but what links did you find searching, maybe: resize encrypted Linux partition? The first one's outdated but definitely gives you some good starts to cross reference. Here's another example: https://unix.stackexchange.com/quest...etup-resize-do
also old but anyone who's (or not) done it, is just gonna show you what the manuals and searches told them?

Switching drives I'm sure you've backed up data, if you needed to... I'd just go for it and then come back if need be.

syg00 · 04-24-2023, 06:54 PM

For all those that continually bleat that LVM isn't appropriate for home users, take note. This is a piece of cake were LVM in place.

Regardless, the steps are basically the same as for a non-LUKS setup - and much easier than shrinking let it be known. Enlarge the partition, close and open the container, resize the filesystem. Add a few fsck for sanity.
In your case you'll have to get that swap out of the way - is it used for hibernation ?.

goumba · 04-25-2023, 03:38 PM

I would boot from a live distro, or a rescue system.

With the container *closed*, resize the partition, then the filesystem. Open the container (do *not* mount) and run fsck on the container device (/dev/mapper/luks-b933ced7-96d3-4f5b-87cd-780e5664aca4).

Using something like parted you could simply move that swap partition (warning: math will be involved), or any other tool delete and recreate it. Deleting and recreating will change the UUID and involve editing /etc/crypttab (or you may find you can no longer boot until it's fixed).